Effect of strip edge temperature drop of electrical steel on profile and flatness during hot rolling process

Liu, Yanlin; Cao, Jian; Qiu, Lan; Kong, Ning; He, Anrui; Zhou, Yizhong

doi:10.1177/1687814019840471

Cited by 13 publications

(9 citation statements)

References 18 publications

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“…Especially, decreased temperature at the edge exists in almost all strip steels, which could cause bulge or local high point around the edges for the rolled steel under single‐phase state. This result coincides with the conclusions of the literature by Li et al [ 22 ] and Liu et al [ 19 ] In hot rolling process, bulge is difficult to be removed in the latter stand of the hot strip mill. If the bulge is not eliminated after hot rolling, edge defects like side wave may appear in cold rolling process.…”

Section: Resultssupporting

confidence: 93%

Effects of Transversal Temperature Distribution and Phase State on Strip Profile During Hot Rolling Process

Dong

Liu

et al. 2023

steel research int.

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Transversal temperature distribution and phase transformation of the strip steel in hot rolling process are analyzed by thermographic observations and thermal simulation tests. The effects of transversal temperature distribution and phase state on strip profile are investigated by finite element (FE) simulations, in which the material model of the strip steel is generated from the thermal simulation tests and a constitutive model. FE calculation shows that the decreased temperature at the edge causes smaller strip crown with the dual‐phase state, while it leads to edge bulges in strip profile under single‐phase state. With the convex temperature distribution, large strip crown is witnessed under dual‐phase state; small crowns or even edge bulges appear under the single‐phase state. For the concave temperature distribution, opposite conclusions are drawn compared with the convex temperature distribution. Measures to prevent edge bulges and control the strip crown are proposed and applied to industrial production. Reheating the edge area and assigning large target crown to the former stand of the finishing mill can avoid the edge bulges. Strip crown of the steel is more significantly affected by the bending force under dual‐phase state than that under single‐phase state.

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Section: Resultssupporting

confidence: 93%

Effects of Transversal Temperature Distribution and Phase State on Strip Profile During Hot Rolling Process

Dong

Liu

et al. 2023

steel research int.

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“…To demonstrate the constitutive intrinsic relations of ε , σ and T, the Arrhenius model [3] was used to demonasted 0.5wt.% Ni-modified graphene/2024 Al matrix composites materials thermal deformation behavior.…”

Section: Constitutive Equationmentioning

confidence: 99%

Hot Deformation Behavior of Ni-Modified Graphene/2024 Al Matrix Composites

Liu²,

Kou³

et al. 2023

J. Phys.: Conf. Ser.

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The 0.5 wt.% Ni-modified graphene/2024 Al matrix composites were formed by hot compression at the temperature(T) was 300-450 °C, the strain rate( ε ˙ ) was 0.001-1 s−1. The influence of T and ε ˙ on the flow stress(σ) behavior of the composites was analyzed. Moreover, the metamorphic activation energy of the composites was deduced from the stress-strain data, and the Arrhenius constitutive equation relation of the composites was constructed. According to the dynamic model, the hot processing maps of composites were calculated and analyzed. The Arrhenius constitutive equation of the material is established and the Q is 222.22951 KJ/mol by the peak stress. According to the hot processing maps, the hot instability region of the hot deformation in the experimental parameter interval is determined. Furthermore, the optimal machining interval parameters of the material are proposed to be the ε ˙ of 0.011-0.368 s−1, the hot working T of 420 - 450 °C.

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“…[8][9][10][11] The determination of the critical stress depends on the buckling model. [12][13][14][15][16][17] Due to the high-temperature phase transformation characteristics of some steel grades, like thin gauge and high strength steel or non-oriented electrical steel, 18) the multiphase rolling caused by uneven temperature distribution along the strip width is inevitable during hot finishing rolling as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Effect of Uneven Distribution of Material Property on Buckling Behavior of Strip during Hot Finishing Rolling

Liu

et al. 2023

ISIJ Int.

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Unlike traditional austenitic rolling, there is phase transformation during hot finishing rolling for thin gauge and high strength steel or non-oriented electrical steel. The transverse differences of temperature and asynchronous phase transformation result in uneven distribution of material property of rolled strip, further change the buckling behavior of strip during hot finishing rolling. By replacing the elastic modulus constant in the traditional buckling model with the distribution function of tangent modulus obtained by multiphase compression experiments and multifield coupling simulation, the effect of uneven distribution of material property on the critical buckling stress and buckling wave length are analyzed. The results show that for the global longitudinal wave, the critical buckling stress at the exit of stand is greater than that at the entry. But the opposite is true for the local longitudinal wave. Under the effect of uneven distribution of material property, the critical buckling stress and buckling wavelength of global and local center waves change little. The critical buckling stress of global edge wave is almost unchanged, but the buckling wavelength decreases slightly. The critical buckling stress and buckling wavelength of local edge wave are reduced obviously, and the buckling wavelength is decreased by about 10%. It means that the existence of soft ferrite at the strip edge easily makes the wave mode develop to "fragmented edge wave", which is consistent with the actual phenomenon.

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Effect of strip edge temperature drop of electrical steel on profile and flatness during hot rolling process

Cited by 13 publications

References 18 publications

Effects of Transversal Temperature Distribution and Phase State on Strip Profile During Hot Rolling Process

Effects of Transversal Temperature Distribution and Phase State on Strip Profile During Hot Rolling Process

Hot Deformation Behavior of Ni-Modified Graphene/2024 Al Matrix Composites

Effect of Uneven Distribution of Material Property on Buckling Behavior of Strip during Hot Finishing Rolling

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